In an Aether composed of an air like matter (blue section), elastic collisions can be relatively straight forward. In a more dense setting (green section), particles can have curved trajectories.
There are 4 factors that influence curvature:
- Density - friction with contact matter is needed, for curvature to happen.
- Rotation - forward motion is generated, when spinning objects are in contact with other objects.
- Frequency/Energy - In relation with forward motion 'spin' can have little or large consequences.
- Structure - an object with a profile that has a different grip on it's surrounding matter will transfer its energy in a different manner.
This last clip is a promotional clip for a Blitzball, wich has a special profile to generate more curve: